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What system do yellow light, ultraviolet waves and x-rays pertain to?
They are part of the electromagnetic system.
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What happens to light when it passes through a concave lens?
The light spreads apart.
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What is the iris?
It is the muscular part of the eye that controls how much light enters the eye.
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What is a translucent?
It is the type of material used to make stained glass windows.
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What is the cochlea?
It is the part of the ear that is filled with liquid that vibrates causing little hairs to move.
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When does light retract?
Light retracts when it moves from one medium to another.
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How are light waves and sound waves familiar?
They both carry energy.
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On a musical instrument, if one string vibrates more quickly than the other, what does that mean?
On could say that it will have a high pitch.
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If a person is travelling in complete silence, where are they travelling?
They are in outer space.
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What type of a wave is a sound wave?
It is a longitudinal wave.
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What energy forms by vibrating objects?
Sound energy is formed.
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How do wind instruments produce sound?
Wind instruments produce sound when the person blows air across a hole causing the particles in a column of air to vibrate.
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Why do shorter instruments have higher pitches?
Shorter instruments have higher pitches because they have a shorter column of air.
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What are two important souces of light to life and on Earth?
The Sun and Fire.
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What is the Sun?
It is a source of light that warms Earth and allows plants to make their own food.
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What is fire?
Fire is also a source, and it provides people with warmth, light and a way to cook food.
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What is the speed of sound through different mediums?
From fastest to slowest, sound waves travel through the flowing materials, in this order:
- - Wooden Block
- - Pond Water
- - Cold Air
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Explain why sound travels through different mediums at different speeds.
- - When sound travels, it compresses the particles in the medium (material).
- - The speed will depend on how close the particles in the medium are to one another.
- - In solids, particles are crowded together allowing sound to travel quickly.
- -In liquid, particles are further apart, so sound travels slower.
- - Gas is where particles are the further apart, so sound travels slowest through air.
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